Shearing chisel



Jan. 8, 1946.

| s NAMETH SHEARING CHISEL 7 Filed March 7, 1945 Patented Jan. 8, 1946 SHEARING CHISEL Louis S. Nameth, Lakewood, Ohio, assignor of thirty-three and one-third per cent to Charles H. Sanborn and thirty-three and one-third per cent to Lewis A. Harvey, Ashtabula, Ohio Application March '7, 1945, Serial No. 581,491

2 Claims.

The present invention relates to new and useful improvements in tools adapted to cut and pry loose the overlapping telescoping ends of metal sheets or tubes and cutting and loosening the outer layer without injuring or distorting the under or inner layer of the material.

The invention is particularly adapted for use in removing mufilers from the exhaust line of automobiles by cutting a slot in the muffler at the connection thereof and at the same time pryin loose the mufller from the exhaust line Without damaging or distorting the latter.

A further object is to provide a device of this character of simple and practical construction,

which is efficient and reliable in operation, rela-- tively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing, forming part hereof, wherein like reference numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view of the tool shown in use for removing the connected ends of a tube and with the tube shown in section,

Figure 2 is a top plan view of the tool,

Figure 3 is a fragmentary side elevational view of the front end of the tool,

Figure 4 is a sectional view, taken substantially on a line 4-4 of Figure 1,

Figure 5 is a transverse sectional view taken substantially on a line 55 of Figure 3, and

Figure 6 is a similar view of a modified tool construction.

Referring now to the drawing'in detail, wherein, for the purpose of illustration, I have disclosed a preferred embodiment of the invention,- the numeral 5 designates the shank or handle of the tool which is preferably of hexagonal shape in cross section, the front cutting end of the tool designated generally at 6 having flat tapering sides 1 and flat tapering upper and lower surfaces 8 and 9, respectively.

The top surface of the cutting end 6 of the tool is formed with a longitudinally extending rib I9 terminating at its front end in a tapering, relatively narrow, sharpened blade ll.

At each side of the rib ID, the sides of the cutting end 6 are shaped in the form of wedges l2 and I3, the lower edge of which is co-planar with the bottom surface 9 of the cuttingend of the tool, as will be apparent from an inspection of Figure 5 of the drawing. The upper surface of the wedge I2 is slightly curved, as indicated at M, and tapers forwardly to a feather edge l5 proversely curved, as indicated at IS in Figure 6 of the drawing, when the tool is used for separating the connected ends of tubular material such as indicated at l! in Figure 1.

In the operation of the tool, the cutting end 6 is placed under the overlapping or telescoping end I8 of the work, and upon striking the rear end of the tool with a hammer blow, the blade I I will cut a longitudinally extending slot in the overlapping edge J8 and roll the material out from the slot, as indicated at l9, while the wedges l2 and I3 will ride under the edge of the work I8 at either side of the slot in a manner as indicated in Figure l of the drawing, while the bottom 9 of the cutting end of the tool rides flatly along the underlying portion of the Work, whereby the overlying edge of the work will be pried loose and the connected ends of the work thus separated without injury or distortion to the underlying portion thereof.

It is believed that the details of construction and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention, what I claim is:

l. A tool of the class described comprising a shank portion and a tapering cutting end, said cutting end including a longitudinally extending rib on the upper surface thereof terminating in a sharpened blade at the front end of the rib and adapted to cut a slot in the edge of an outer layer of work, and wedges formed at the side of said rib and adapted to ride under the work at the side of said slot, the front end of said wedges being disposed rearwardly of the front end of the rib.

2. A tool of the class described, comprising a shank portion and a tapering cutting end, said cutting end including a longitudinally extending rib on the upper surface thereof terminating in a sharpened blade at the front end'of the rib and adapted to cut a slot in the edge of an outer layer of work, and wedges formed at the side of said rib and adapted to ride under the work at the side of said slot, said Wedges having curved upper edges and the front end of the wedges terminating rearwardly of the front end of the rib.

LOUIS S. NAMETH. 

